refactor(wiki): migrate this repo's .wiki/ to canonical Karpathy layout

Stop being inconsistent with our own fixed project-bootstrap template.

- SUMMARY.md → index.md (catalog by type, with one-line hooks)
- source/*.md → concepts/*.md (with `git mv` so history is preserved)
- WORKFLOW.md removed (workflow lives in wiki-maintainer, not duplicated here)
- New: .wiki/CLAUDE.md (project schema, Karpathy gist URL pinned at top)
- New: log.md (append-only op log; backfilled with prior decisions)
- New: overview.md (single project intro page)
- New: raw/README.md (immutability note; replaces .gitkeep placeholder)
- Empty .gitkeep added to entities/, packages/, sources/
- Migrated pages got `type: concept` frontmatter

After this, wiki-maintainer reads .wiki/CLAUDE.md → index.md as it expects,
and the layout matches what newly-bootstrapped projects will look like.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.wiki/concepts/repo-layout.md

@@ -0,0 +1,59 @@
+---
+title: Repo Layout & Skill Workflow
+type: concept
+updated: 2026-04-28
+---
+
+# Repo Layout & Skill Workflow
+
+_Decision: 2026-04-28. Approved by Vitya in chat._
+
+## Goal
+
+Single-source workshop for personal Claude skills. Edit here, build `.skill` archives here, install to `~/.claude/skills/` here. Repo must roll out cleanly to multiple machines.
+
+## Layout
+
+```
+claude-skills/
+├── skills/                  ← editable sources (source of truth)
+│   ├── caveman/
+│   ├── caveman-commit/
+│   ├── caveman-compress/
+│   ├── caveman-help/
+│   ├── caveman-review/
+│   ├── compress/
+│   ├── find-skills/
+│   ├── project-bootstrap/
+│   ├── task-status-wiki/
+│   ├── using-context7/
+│   ├── using-markitdown/
+│   └── wiki-maintainer/
+├── dist/                    ← built .skill archives (committed)
+├── scripts/
+│   ├── build.sh             ← skills/<name>/ → dist/<name>.skill
+│   └── install.sh           ← skills/<name>/ → ~/.claude/skills/<name>/
+├── .wiki/, .tasks/, CLAUDE.md, README.md, .gitignore
+```
+
+## Build & Install Model
+
+- **Source of truth:** `skills/<name>/` — a regular folder with `SKILL.md` + optional `assets/`, `references/`, etc. Mirrors the on-disk format Claude expects in `~/.claude/skills/`.
+- **Build:** `scripts/build.sh [name...]` zips each `skills/<name>/` into `dist/<name>.skill`. No args → builds all.
+- **Install:** `scripts/install.sh [name...]` copies (not symlinks) each `skills/<name>/` into `~/.claude/skills/<name>/`, replacing any existing folder. No args → installs all.
+- **`.skill` archives are committed** to `dist/`. New machine: clone → run `install.sh` and you're set. No build dependency on the install path.
+- **Cross-platform:** scripts are bash (works in git-bash on Windows + native on Linux/Mac). PowerShell variant added if/when needed.
+
+## Conventions
+
+- One folder per skill, name = skill name.
+- Skill content authority: this repo. `~/.claude/skills/` is downstream.
+- `dist/*.skill` regenerated by build script — never edited by hand.
+- Editing flow: edit `skills/<name>/`, run `install.sh <name>` to push to live, run `build.sh <name>` to refresh archive, commit.
+
+## Out of scope (for now)
+
+- Versioning of individual skills (no `version` field, no changelog per skill).
+- Manifest/registry file — flat folder is enough at 12 skills; revisit at ~30+.
+- CI / automated builds — manual-only.
+- Plugin skills (superpowers, frontend-design, etc.) — managed by plugin system, not mirrored here.